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qgsadvanceddigitizingdockwidget.cpp
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qgsadvanceddigitizingdockwidget.cpp
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/***************************************************************************
qgsadvanceddigitizingdockwidget.cpp - dock for CAD tools
----------------------
begin : October 2014
copyright : (C) Denis Rouzaud
email : denis.rouzaud@gmail.com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include <QSettings>
#include "math.h"
#include "qgisapp.h"
#include "qgsadvanceddigitizingdockwidget.h"
#include "qgsadvanceddigitizingcanvasitem.h"
#include "qgsapplication.h"
#include "qgsexpression.h"
#include "qgslogger.h"
#include "qgsmapcanvas.h"
#include "qgsmapmouseevent.h"
#include "qgsmaptoolcapture.h"
#include "qgsmaptooladvanceddigitizing.h"
#include "qgsmessagebaritem.h"
#include "qgspoint.h"
bool QgsAdvancedDigitizingDockWidget::lineCircleIntersection( const QgsPoint& center, const double radius, const QList<QgsPoint>& segment, QgsPoint& intersection )
{
Q_ASSERT( segment.count() == 2 );
// formula taken from http://mathworld.wolfram.com/Circle-LineIntersection.html
const double x1 = segment[0].x() - center.x();
const double y1 = segment[0].y() - center.y();
const double x2 = segment[1].x() - center.x();
const double y2 = segment[1].y() - center.y();
const double dx = x2 - x1;
const double dy = y2 - y1;
const double dr = sqrt( pow( dx, 2 ) + pow( dy, 2 ) );
const double d = x1 * y2 - x2 * y1;
const double disc = pow( radius , 2 ) * pow( dr, 2 ) - pow( d, 2 );
if ( disc < 0 )
{
//no intersection or tangeant
return false;
}
else
{
// two solutions
const int sgnDy = dy < 0 ? -1 : 1;
const double ax = center.x() + ( d * dy + sgnDy * dx * sqrt( pow( radius, 2 ) * pow( dr, 2 ) - pow( d, 2 ) ) ) / ( pow( dr, 2 ) );
const double ay = center.y() + ( -d * dx + qAbs( dy ) * sqrt( pow( radius, 2 ) * pow( dr, 2 ) - pow( d, 2 ) ) ) / ( pow( dr, 2 ) );
const QgsPoint p1( ax, ay );
const double bx = center.x() + ( d * dy - sgnDy * dx * sqrt( pow( radius, 2 ) * pow( dr, 2 ) - pow( d, 2 ) ) ) / ( pow( dr, 2 ) );
const double by = center.y() + ( -d * dx - qAbs( dy ) * sqrt( pow( radius, 2 ) * pow( dr, 2 ) - pow( d, 2 ) ) ) / ( pow( dr, 2 ) );
const QgsPoint p2( bx, by );
// snap to nearest intersection
if ( intersection.sqrDist( p1 ) < intersection.sqrDist( p2 ) )
{
intersection.set( p1.x(), p1.y() );
}
else
{
intersection.set( p2.x(), p2.y() );
}
return true;
}
}
QgsAdvancedDigitizingDockWidget::QgsAdvancedDigitizingDockWidget( QgsMapCanvas* canvas, QWidget *parent )
: QDockWidget( parent )
, mMapCanvas( canvas )
, mMapToolList( QList<QgsMapToolAdvancedDigitizing*>() )
, mCurrentMapTool( 0 )
, mCadEnabled( false )
, mConstructionMode( false )
, mSnappingEnabled( true )
, mCommonAngleConstraint( QSettings().value( "/Cad/CommonAngle", 90 ).toInt() )
, mCadPointList( QList<QgsPoint>() )
, mPointSnapped( false )
, mSnappedSegment( QList<QgsPoint>() )
{
setupUi( this );
mCadPaintItem = new QgsAdvancedDigitizingCanvasItem( canvas, this ) ;
mAngleConstraint = new CadConstraint( mAngleLineEdit, mLockAngleButton, mRelativeAngleButton );
mDistanceConstraint = new CadConstraint( mDistanceLineEdit, mLockDistanceButton ) ;
mXConstraint = new CadConstraint( mXLineEdit, mLockXButton, mRelativeXButton );
mYConstraint = new CadConstraint( mYLineEdit, mLockYButton, mRelativeYButton ) ;
mAdditionalConstraint = NoConstraint ;
mAngleLineEdit->installEventFilter( this );
mDistanceLineEdit->installEventFilter( this );
mXLineEdit->installEventFilter( this );
mYLineEdit->installEventFilter( this );
// this action is also used in the advanced digitizing tool bar
mEnableAction = new QAction( this );
mEnableAction->setText( tr( "Enable advanced digitizing tools" ) );
mEnableAction->setIcon( QgsApplication::getThemeIcon( "/cadtools/cad.png" ) );
mEnableAction->setCheckable( true );
mEnabledButton->addAction( mEnableAction );
mEnabledButton->setDefaultAction( mEnableAction );
// enable/disable on map tool change
connect( canvas, SIGNAL( mapToolSet( QgsMapTool* ) ), this, SLOT( mapToolChanged( QgsMapTool* ) ) );
// Connect the UI to the event filter to update constraints
connect( mEnableAction, SIGNAL( triggered( bool ) ), this, SLOT( activateCad( bool ) ) );
connect( mConstructionModeButton, SIGNAL( clicked( bool ) ), this, SLOT( setConstructionMode( bool ) ) );
connect( mParallelButton, SIGNAL( clicked( bool ) ), this, SLOT( addtionalConstraintClicked( bool ) ) );
connect( mPerpendicularButton, SIGNAL( clicked( bool ) ), this, SLOT( addtionalConstraintClicked( bool ) ) );
connect( mLockAngleButton, SIGNAL( clicked( bool ) ), this, SLOT( lockConstraint( bool ) ) );
connect( mLockDistanceButton, SIGNAL( clicked( bool ) ), this, SLOT( lockConstraint( bool ) ) );
connect( mLockXButton, SIGNAL( clicked( bool ) ), this, SLOT( lockConstraint( bool ) ) );
connect( mLockYButton, SIGNAL( clicked( bool ) ), this, SLOT( lockConstraint( bool ) ) );
connect( mRelativeAngleButton, SIGNAL( clicked( bool ) ), this, SLOT( setConstraintRelative( bool ) ) );
connect( mRelativeXButton, SIGNAL( clicked( bool ) ), this, SLOT( setConstraintRelative( bool ) ) );
connect( mRelativeYButton, SIGNAL( clicked( bool ) ), this, SLOT( setConstraintRelative( bool ) ) );
connect( mAngleLineEdit, SIGNAL( returnPressed() ), this, SLOT( lockConstraint() ) );
connect( mDistanceLineEdit, SIGNAL( returnPressed() ), this, SLOT( lockConstraint() ) );
connect( mXLineEdit, SIGNAL( returnPressed() ), this, SLOT( lockConstraint() ) );
connect( mYLineEdit, SIGNAL( returnPressed() ), this, SLOT( lockConstraint() ) );
// errors messages
mErrorMessage = new QgsMessageBarItem( tr( "CAD tools" ),
tr( "Some constraints are incompatible. Resulting point might be incorrect." ),
QgsMessageBar::WARNING, 0 );
mErrorMessageDisplayed = false;
mapToolChanged( NULL );
// config menu
QMenu *menu = new QMenu( this );
// common angles
QActionGroup* actionGroup = new QActionGroup( menu ); // actions are exclusive for common angles
mCommonAngleActions = QMap<QAction*, int>();
QList< QPair< int, QString > > commonAngles;
commonAngles << QPair<int, QString>( 30, tr( "Snap to 30%1 angles" ).arg( QString::fromUtf8( "°" ) ) );
commonAngles << QPair<int, QString>( 45, tr( "Snap to 45%1 angles" ).arg( QString::fromUtf8( "°" ) ) );
commonAngles << QPair<int, QString>( 90, tr( "Snap to 90%1 angles" ).arg( QString::fromUtf8( "°" ) ) );
commonAngles << QPair<int, QString>( 0, tr( "Do not snap to common angles" ) );
for ( QList< QPair< int, QString > >::const_iterator it = commonAngles.begin(); it != commonAngles.end(); ++it )
{
QAction* action = new QAction( it->second, menu );
action->setCheckable( true );
action->setChecked( it->first == mCommonAngleConstraint );
menu->addAction( action );
actionGroup->addAction( action );
mCommonAngleActions.insert( action, it->first );
}
// snapping on layers
menu->addSeparator();
mSnappingEnabledAction = new QAction( tr( "Snap on layers" ), menu );
mSnappingEnabledAction->setCheckable( true );
mSnappingEnabledAction->setChecked( mSnappingEnabled );
menu->addAction( mSnappingEnabledAction );
mSettingsButton->setMenu( menu );
connect( mSettingsButton, SIGNAL( triggered( QAction* ) ), this, SLOT( settingsButtonTriggered( QAction* ) ) );
updateCapacity( true );
}
QgsAdvancedDigitizingDockWidget::~QgsAdvancedDigitizingDockWidget()
{
delete mErrorMessage;
}
void QgsAdvancedDigitizingDockWidget::hideEvent( QHideEvent* )
{
// disable CAD but do not unset map event filter
// so it will be reactivated whenever the map tool is show again
setCadEnabled( false );
}
void QgsAdvancedDigitizingDockWidget::mapToolChanged( QgsMapTool* tool )
{
QgsMapToolAdvancedDigitizing* toolMap = dynamic_cast<QgsMapToolAdvancedDigitizing*>( tool );
mCurrentMapTool = 0;
QString lblText;
if ( !tool )
{
lblText = tr( "No map tool set" );
}
else if ( !toolMap || !toolMap->cadAllowed() )
{
lblText = tr( "CAD tools are not enabled for the current map tool" );
QString toolName = tool->toolName();
if ( !toolName.isEmpty() )
{
lblText.append( QString( " (%1)" ).arg( toolName ) );
}
}
else if ( mMapCanvas->mapSettings().destinationCrs().geographicFlag() )
{
lblText = tr( "CAD tools can not be used on geographic coordinates. Change the coordinates system in the project properties." );
}
else
{
mCurrentMapTool = toolMap;
}
if ( mCurrentMapTool )
{
mEnableAction->setEnabled( true );
mErrorLabel->hide();
mCadWidget->show();
setMaximumSize( 5000, 220 );
// restore previous status
const bool enabled = QSettings().value( "/Cad/SessionActive", false ).toBool();
if ( enabled && !isVisible() )
{
show();
}
setCadEnabled( enabled );
}
else
{
mEnableAction->setEnabled( false );
mErrorLabel->setText( lblText );
mErrorLabel->show();
mCadWidget->hide();
setMaximumSize( 5000, 80 );
setCadEnabled( false );
}
}
void QgsAdvancedDigitizingDockWidget::setCadEnabled( bool enabled )
{
mCadEnabled = enabled;
mEnableAction->setChecked( enabled );
mCadButtons->setEnabled( enabled );
mInputWidgets->setEnabled( enabled );
clearPoints();
releaseLocks();
setConstructionMode( false );
}
void QgsAdvancedDigitizingDockWidget::activateCad( bool enabled )
{
enabled &= mCurrentMapTool != 0;
if ( mErrorMessageDisplayed )
{
QgisApp::instance()->messageBar()->popWidget( mErrorMessage );
}
QSettings().setValue( "/Cad/SessionActive", enabled );
if ( enabled && !isVisible() )
{
show();
}
setCadEnabled( enabled );
}
void QgsAdvancedDigitizingDockWidget::addtionalConstraintClicked( bool activated )
{
if ( !activated )
{
lockAdditionalConstraint( NoConstraint );
}
if ( sender() == mParallelButton )
{
lockAdditionalConstraint( Parallel );
}
else if ( sender() == mPerpendicularButton )
{
lockAdditionalConstraint( Perpendicular );
}
}
void QgsAdvancedDigitizingDockWidget::setConstraintRelative( bool activate )
{
if ( sender() == mRelativeAngleButton )
{
mAngleConstraint->setRelative( activate );
}
else if ( sender() == mRelativeXButton )
{
mXConstraint->setRelative( activate );
}
else if ( sender() == mRelativeYButton )
{
mYConstraint->setRelative( activate );
}
triggerMouseMoveEvent();
}
void QgsAdvancedDigitizingDockWidget::setConstructionMode( bool enabled )
{
mConstructionMode = enabled;
mConstructionModeButton->setChecked( enabled );
}
void QgsAdvancedDigitizingDockWidget::settingsButtonTriggered( QAction* action )
{
// snapping
if ( action == mSnappingEnabledAction )
{
mSnappingEnabled = !mSnappingEnabled;
mSnappingEnabledAction->setChecked( mSnappingEnabled );
return;
}
// common angles
QMap<QAction*, int>::const_iterator i = mCommonAngleActions.find( action );
if ( i != mCommonAngleActions.end() )
{
i.key()->setChecked( true );
mCommonAngleConstraint = i.value();
QSettings().setValue( "/Cad/CommonAngle", i.value() );
return;
}
}
void QgsAdvancedDigitizingDockWidget::releaseLocks()
{
// release all locks except construction mode
lockAdditionalConstraint( NoConstraint );
mAngleConstraint->setLockMode( CadConstraint::NoLock );
mDistanceConstraint->setLockMode( CadConstraint::NoLock );
mXConstraint->setLockMode( CadConstraint::NoLock );
mYConstraint->setLockMode( CadConstraint::NoLock );
}
void QgsAdvancedDigitizingDockWidget::triggerMouseMoveEvent()
{
// run a fake map mouse event to update the paint item
QPoint globalPos = mMapCanvas->cursor().pos();
QPoint pos = mMapCanvas->mapFromGlobal( globalPos );
QMouseEvent* e = new QMouseEvent( QEvent::MouseMove, pos, globalPos, Qt::NoButton, Qt::NoButton, Qt::NoModifier );
mCurrentMapTool->canvasMoveEvent( e );
}
void QgsAdvancedDigitizingDockWidget::lockConstraint( bool activate /* default true */ )
{
QObject* obj = sender();
CadConstraint* constraint = NULL;
if ( obj == mAngleLineEdit || obj == mLockAngleButton )
{
constraint = mAngleConstraint;
}
else if ( obj == mDistanceLineEdit || obj == mLockDistanceButton )
{
constraint = mDistanceConstraint;
}
else if ( obj == mXLineEdit || obj == mLockXButton )
{
constraint = mXConstraint;
}
else if ( obj == mYLineEdit || obj == mLockYButton )
{
constraint = mYConstraint;
}
if ( !constraint )
{
return;
}
if ( activate )
{
QString textValue = constraint->lineEdit()->text();
bool ok;
double value = textValue.toDouble( &ok );
if ( !textValue.isEmpty() )
{
if ( ok )
{
constraint->setValue( value );
}
else
{
// try to evalute expression
QgsExpression expr( textValue );
QVariant result = expr.evaluate();
value = result.toDouble( &ok );
if ( expr.hasEvalError() || !ok )
{
activate = false;
}
else
{
constraint->setValue( value );
}
}
}
else
{
activate = false;
}
}
constraint->setLockMode( activate ? CadConstraint::HardLock : CadConstraint::NoLock );
if ( activate )
{
// deactivate perpendicular/parallel if angle has been activated
if ( constraint == mAngleConstraint )
{
lockAdditionalConstraint( NoConstraint );
}
// run a fake map mouse event to update the paint item
triggerMouseMoveEvent();
}
}
void QgsAdvancedDigitizingDockWidget::lockAdditionalConstraint( AdditionalConstraint constraint )
{
mAdditionalConstraint = constraint;
mPerpendicularButton->setChecked( constraint == Perpendicular );
mParallelButton->setChecked( constraint == Parallel );
}
void QgsAdvancedDigitizingDockWidget::updateCapacity( bool updateUIwithoutChange )
{
CadCapacities newCapacities = 0;
// first point is the mouse point (it doesn't count)
if ( mCadPointList.count() > 1 )
{
newCapacities |= AbsoluteAngle | RelativeCoordinates;
}
if ( mCadPointList.count() > 2 )
{
newCapacities |= RelativeAngle;
}
if ( !updateUIwithoutChange && newCapacities == mCapacities )
{
return;
}
// update the UI according to new capacities
// still keep the old to compare
bool relativeAngle = mCadEnabled && newCapacities.testFlag( RelativeAngle );
bool absoluteAngle = mCadEnabled && newCapacities.testFlag( AbsoluteAngle );
bool relativeCoordinates = mCadEnabled && newCapacities.testFlag( RelativeCoordinates );
mPerpendicularButton->setEnabled( absoluteAngle );
mParallelButton->setEnabled( absoluteAngle );
if ( !absoluteAngle )
{
lockAdditionalConstraint( NoConstraint );
}
// absolute angle = azimuth, relative = from previous line
mLockAngleButton->setEnabled( absoluteAngle );
mRelativeAngleButton->setEnabled( relativeAngle );
mAngleLineEdit->setEnabled( absoluteAngle );
if ( !absoluteAngle )
{
mAngleConstraint->setLockMode( CadConstraint::NoLock );
}
if ( !relativeAngle )
{
mAngleConstraint->setRelative( false );
}
else if ( relativeAngle && !mCapacities.testFlag( RelativeAngle ) )
{
// set angle mode to relative if can do and wasn't available before
mAngleConstraint->setRelative( true );
}
// distance is alway relative
mLockDistanceButton->setEnabled( relativeCoordinates );
mDistanceLineEdit->setEnabled( relativeCoordinates );
if ( !relativeCoordinates )
{
mDistanceConstraint->setLockMode( CadConstraint::NoLock );
}
mRelativeXButton->setEnabled( relativeCoordinates );
mRelativeYButton->setEnabled( relativeCoordinates );
// update capacities
mCapacities = newCapacities;
}
bool QgsAdvancedDigitizingDockWidget::applyConstraints( QgsMapMouseEvent* e )
{
bool res = true;
QgsDebugMsg( "Contraints (locked / relative / value" );
QgsDebugMsg( QString( "Angle: %1 %2 %3" ).arg( mAngleConstraint->isLocked() ).arg( mAngleConstraint->relative() ).arg( mAngleConstraint->value() ) );
QgsDebugMsg( QString( "Distance: %1 %2 %3" ).arg( mDistanceConstraint->isLocked() ).arg( mDistanceConstraint->relative() ).arg( mDistanceConstraint->value() ) );
QgsDebugMsg( QString( "X: %1 %2 %3" ).arg( mXConstraint->isLocked() ).arg( mXConstraint->relative() ).arg( mXConstraint->value() ) );
QgsDebugMsg( QString( "Y: %1 %2 %3" ).arg( mYConstraint->isLocked() ).arg( mYConstraint->relative() ).arg( mYConstraint->value() ) );
QgsPoint point = e->mapPoint( &mPointSnapped );
mSnappedSegment = e->snappedSegment();
bool previousPointExist, penulPointExist;
QgsPoint previousPt = previousPoint( &previousPointExist );
QgsPoint penultimatePt = penultimatePoint( &penulPointExist );
// *****************************
// ---- X Constrain
if ( mXConstraint->isLocked() )
{
if ( !mXConstraint->relative() )
{
point.setX( mXConstraint->value() );
}
else if ( mCapacities.testFlag( RelativeCoordinates ) )
{
point.setX( previousPt.x() + mXConstraint->value() );
}
if ( !mSnappedSegment.isEmpty() && !mXConstraint->isLocked() )
{
// intersect with snapped segment line at X ccordinate
const double dx = mSnappedSegment[1].x() - mSnappedSegment[0].x();
if ( dx == 0 )
{
point.setY( mSnappedSegment[0].y() );
}
else
{
const double dy = mSnappedSegment[1].y() - mSnappedSegment[0].y();
point.setY( mSnappedSegment[0].y() + ( dy * ( point.x() - mSnappedSegment[0].x() ) ) / dx );
}
}
}
// *****************************
// ---- Y Constrain
if ( mYConstraint->isLocked() )
{
if ( !mYConstraint->relative() )
{
point.setY( mYConstraint->value() );
}
else if ( mCapacities.testFlag( RelativeCoordinates ) )
{
point.setY( previousPt.y() + mYConstraint->value() );
}
if ( !mSnappedSegment.isEmpty() && !mYConstraint->isLocked() )
{
// intersect with snapped segment line at Y ccordinate
const double dy = mSnappedSegment[1].y() - mSnappedSegment[0].y();
if ( dy == 0 )
{
point.setX( mSnappedSegment[0].x() );
}
else
{
const double dx = mSnappedSegment[1].x() - mSnappedSegment[0].x();
point.setX( mSnappedSegment[0].x() + ( dx * ( point.y() - mSnappedSegment[0].y() ) ) / dy );
}
}
}
// *****************************
// ---- Angle constrain
// input angles are in degrees
if ( mAngleConstraint->lockMode() == CadConstraint::SoftLock )
{
// reset the lock
mAngleConstraint->setLockMode( CadConstraint::NoLock );
}
if ( !mAngleConstraint->isLocked() && mCapacities.testFlag( AbsoluteAngle ) && mCommonAngleConstraint != 0 )
{
double commonAngle = mCommonAngleConstraint * M_PI / 180;
// see if soft common angle constraint should be performed
// only if not in HardLock mode
double softAngle = qAtan2( point.y() - previousPt.y(),
point.x() - previousPt.x() );
double deltaAngle = 0;
if ( mAngleConstraint->relative() && mCapacities.testFlag( RelativeAngle ) )
{
// compute the angle relative to the last segment (0° is aligned with last segment)
deltaAngle = qAtan2( previousPt.y() - penultimatePt.y(),
previousPt.x() - penultimatePt.x() );
softAngle -= deltaAngle;
}
int quo = qRound( softAngle / commonAngle );
if ( qAbs( softAngle - quo * commonAngle ) * 180.0 * M_1_PI <= SoftConstraintToleranceDegrees )
{
// also check the distance in pixel to the line, otherwise it's too sticky at long ranges
softAngle = quo * commonAngle ;
// http://mathworld.wolfram.com/Point-LineDistance2-Dimensional.html
// use the direction vector (cos(a),sin(a)) from previous point. |x2-x1|=1 since sin2+cos2=1
const double dist = qAbs( qCos( softAngle + deltaAngle ) * ( previousPt.y() - point.y() )
- qSin( softAngle + deltaAngle ) * ( previousPt.x() - point.x() ) );
if ( dist / mMapCanvas->mapSettings().mapUnitsPerPixel() < SoftConstraintTolerancePixel )
{
mAngleConstraint->setLockMode( CadConstraint::SoftLock );
mAngleConstraint->setValue( 180.0 / M_PI * softAngle );
}
}
}
if ( mAngleConstraint->isLocked() )
{
double angleValue = mAngleConstraint->value() * M_PI / 180;
if ( mAngleConstraint->relative() && mCapacities.testFlag( RelativeAngle ) )
{
// compute the angle relative to the last segment (0° is aligned with last segment)
angleValue += qAtan2( previousPt.y() - penultimatePt.y(),
previousPt.x() - penultimatePt.x() );
}
double cosa = qCos( angleValue );
double sina = qSin( angleValue );
double v = ( point.x() - previousPt.x() ) * cosa + ( point.y() - previousPt.y() ) * sina ;
if ( mXConstraint->isLocked() || mYConstraint->isLocked() )
{
// perform both to detect errors in contraints
if ( mXConstraint->isLocked() )
{
if ( cosa == 0 )
{
res = false;
}
else
{
double x = mXConstraint->value();
if ( !mXConstraint->relative() )
{
x -= previousPt.x();
}
point.setY( previousPt.y() + x * sina / cosa );
}
}
else if ( mYConstraint->isLocked() )
{
if ( sina == 0 )
{
res = false;
}
else
{
double y = mYConstraint->value();
if ( !mYConstraint->relative() )
{
y -= previousPt.y();
}
point.setX( previousPt.x() + y * cosa / sina );
}
}
}
else
{
point.setX( previousPt.x() + cosa * v );
point.setY( previousPt.y() + sina * v );
}
if ( !mSnappedSegment.isEmpty() && !mDistanceConstraint->isLocked() )
{
// magnetize to the intersection of the snapped segment and the lockedAngle
// line of previous point + locked angle
const double x1 = previousPt.x();
const double y1 = previousPt.y();
const double x2 = previousPt.x() + cosa;
const double y2 = previousPt.y() + sina;
// line of snapped segment
const double x3 = mSnappedSegment[0].x();
const double y3 = mSnappedSegment[0].y();
const double x4 = mSnappedSegment[1].x();
const double y4 = mSnappedSegment[1].y();
const double d = ( x1 - x2 ) * ( y3 - y4 ) - ( y1 - y2 ) * ( x3 - x4 );
// do not compute intersection if lines are almost parallel
// this threshold might be adapted
if ( qAbs( d ) > 0.01 )
{
point.setX((( x3 - x4 )*( x1*y2 - y1*x2 ) - ( x1 - x2 )*( x3*y4 - y3*x4 ) ) / d );
point.setY((( y3 - y4 )*( x1*y2 - y1*x2 ) - ( y1 - y2 )*( x3*y4 - y3*x4 ) ) / d );
}
}
}
// *****************************
// ---- Distance constraint
if ( mDistanceConstraint->isLocked() && previousPointExist )
{
if ( mXConstraint->isLocked() || mYConstraint->isLocked() )
{
// perform both to detect errors in contraints
if ( mXConstraint->isLocked() )
{
const QList<QgsPoint> verticalSegment = QList<QgsPoint>()
<< QgsPoint( mXConstraint->value(), point.y() )
<< QgsPoint( mXConstraint->value(), point.y() + 1 );
res &= lineCircleIntersection( previousPt, mDistanceConstraint->value(), verticalSegment, point );
}
if ( mYConstraint->isLocked() )
{
const QList<QgsPoint> horizontalSegment = QList<QgsPoint>()
<< QgsPoint( point.x(), mYConstraint->value() )
<< QgsPoint( point.x() + 1, mYConstraint->value() );
res &= lineCircleIntersection( previousPt, mDistanceConstraint->value(), horizontalSegment, point );
}
}
else
{
const double dist = sqrt( point.sqrDist( previousPt ) );
if ( dist == 0 )
{
// handle case where mouse is over origin and distance constraint is enabled
// take arbitrary horizontal line
point.set( previousPt.x() + mDistanceConstraint->value(), previousPt.y() );
}
else
{
const double vP = mDistanceConstraint->value() / dist;
point.set( previousPt.x() + ( point.x() - previousPt.x() ) * vP,
previousPt.y() + ( point.y() - previousPt.y() ) * vP );
}
if ( !mSnappedSegment.isEmpty() && !mAngleConstraint->isLocked() )
{
// we will magnietize to the intersection of that segment and the lockedDistance !
res &= lineCircleIntersection( previousPt, mDistanceConstraint->value(), snappedSegment(), point );
}
}
}
// *****************************
// ---- caluclate CAD values
QgsDebugMsg( QString( "point: %1 %2" ).arg( point.x() ).arg( point.y() ) );
QgsDebugMsg( QString( "previous point: %1 %2" ).arg( previousPt.x() ).arg( previousPt.y() ) );
QgsDebugMsg( QString( "penultimate point: %1 %2" ).arg( penultimatePt.x() ).arg( penultimatePt.y() ) );
//QgsDebugMsg( QString( "dx: %1 dy: %2" ).arg( point.x() - previousPt.x() ).arg( point.y() - previousPt.y() ) );
//QgsDebugMsg( QString( "ddx: %1 ddy: %2" ).arg( previousPt.x() - penultimatePt.x() ).arg( previousPt.y() - penultimatePt.y() ) );
// set the point coordinates in the map event
e->setPoint( point );
// update the point list
updateCurrentPoint( point );
// *****************************
// ---- update the GUI with the values
// --- angle
if ( !mAngleConstraint->isLocked() && previousPointExist )
{
double angle = 0.0;
if ( penulPointExist && mAngleConstraint->relative() )
{
// previous angle
angle = qAtan2( previousPt.y() - penultimatePt.y(),
previousPt.x() - penultimatePt.x() );
}
angle = ( qAtan2( point.y() - previousPt.y(),
point.x() - previousPt.x()
) - angle ) * 180 / M_PI;
// modulus
angle = fmod( angle, 360.0 );
mAngleConstraint->setValue( angle );
}
// --- distance
if ( !mDistanceConstraint->isLocked() && previousPointExist )
{
mDistanceConstraint->setValue( sqrt( previousPt.sqrDist( point ) ) );
}
// --- X
if ( !mXConstraint->isLocked() )
{
if ( previousPointExist && mXConstraint->relative() )
{
mXConstraint->setValue( point.x() - previousPt.x() );
}
else
{
mXConstraint->setValue( point.x() );
}
}
// --- Y
if ( !mYConstraint->isLocked() )
{
if ( previousPointExist && mYConstraint->relative() )
{
mYConstraint->setValue( point.y() - previousPt.y() );
}
else
{
mYConstraint->setValue( point.y() );
}
}
return res;
}
bool QgsAdvancedDigitizingDockWidget::alignToSegment( QgsMapMouseEvent* e, CadConstraint::LockMode lockMode )
{
if ( mAdditionalConstraint == NoConstraint )
{
return false;
}
bool previousPointExist, penulPointExist, mSnappedSegmentExist;
QgsPoint previousPt = previousPoint( &previousPointExist );
QgsPoint penultimatePt = penultimatePoint( &penulPointExist );
QList<QgsPoint> mSnappedSegment = e->snappedSegment( &mSnappedSegmentExist );
if ( !previousPointExist || !mSnappedSegmentExist )
{
return false;
}
double angle = qAtan2( mSnappedSegment[0].y() - mSnappedSegment[1].y(), mSnappedSegment[0].x() - mSnappedSegment[1].x() );
if ( mAngleConstraint->relative() && penulPointExist )
{
angle -= qAtan2( previousPt.y() - penultimatePt.y(), previousPt.x() - penultimatePt.x() );
}
if ( mAdditionalConstraint == Perpendicular )
{
angle += M_PI_2;
}
angle *= 180 / M_PI;
mAngleConstraint->setValue( angle );
mAngleConstraint->setLockMode( lockMode );
if ( lockMode == CadConstraint::HardLock )
{
mAdditionalConstraint = NoConstraint;
}
return true;
}
bool QgsAdvancedDigitizingDockWidget::canvasPressEventFilter( QgsMapMouseEvent* e )
{
Q_UNUSED( e );
return mCadEnabled && mConstructionMode;
}
bool QgsAdvancedDigitizingDockWidget::canvasReleaseEventFilter( QgsMapMouseEvent* e )
{
if ( !mCadEnabled )
return false;
if ( mErrorMessageDisplayed )
{
QgisApp::instance()->messageBar()->popWidget( mErrorMessage );
mErrorMessageDisplayed = false;
}
if ( e->button() == Qt::RightButton )
{
clearPoints();
releaseLocks();
return false;
}
applyConstraints( e );
if ( alignToSegment( e ) )
{
// launch a fake move event so rubber bands of map tools will be adapted with new constraints
mCurrentMapTool->canvasMoveEvent( e );
// Parallel or perpendicular mode and snapped to segment
// this has emitted the lockAngle signal
return true;
}
addPoint( e->mapPoint() );
releaseLocks();
if ( e->button() == Qt::LeftButton )
{
// stop digitizing if not intermediate point and if line or polygon
if ( !mConstructionMode &&
( e->mapTool()->mode() == QgsMapToolCapture::CaptureNone ||
e->mapTool()->mode() == QgsMapToolCapture::CapturePoint ) )
{
clearPoints();
}
}
return mConstructionMode;
}
bool QgsAdvancedDigitizingDockWidget::canvasMoveEventFilter( QgsMapMouseEvent* e )
{
if ( !mCadEnabled )
return false;
if ( !applyConstraints( e ) )
{
if ( !mErrorMessageDisplayed )
{
QgisApp::instance()->messageBar()->pushItem( mErrorMessage );
mErrorMessageDisplayed = true;
}
}
else if ( mErrorMessageDisplayed )
{
QgisApp::instance()->messageBar()->popWidget( mErrorMessage );
mErrorMessageDisplayed = false;
}
// perpendicular/parallel constraint
// do a soft lock when snapping to a segment
alignToSegment( e, CadConstraint::SoftLock );
mCadPaintItem->update();
return false;
}
bool QgsAdvancedDigitizingDockWidget::canvasKeyPressEventFilter( QKeyEvent* e )
{
// event on map tool
if ( !mCadEnabled )
return false;
switch ( e->key() )
{
case Qt::Key_Backspace:
case Qt::Key_Delete:
{
removePreviousPoint();
releaseLocks();
break;
}
case Qt::Key_Escape:
{
releaseLocks();
break;
}
default:
{
keyPressEvent( e );
break;
}
}
// for map tools, continues with key press in any case
return false;
}
void QgsAdvancedDigitizingDockWidget::keyPressEvent( QKeyEvent *e )
{
// event on dock (this)
if ( !mCadEnabled )
return;
switch ( e->key() )
{
case Qt::Key_Backspace:
case Qt::Key_Delete:
{
removePreviousPoint();
releaseLocks();
break;
}
case Qt::Key_Escape:
{
releaseLocks();
break;
}
default:
{
filterKeyPress( e );
break;
}
}
}
bool QgsAdvancedDigitizingDockWidget::eventFilter( QObject* obj, QEvent* event )
{
// event for line edits
Q_UNUSED( obj );
if ( event->type() != QEvent::KeyPress )
{
return false;
}
QKeyEvent* keyEvent = dynamic_cast<QKeyEvent*>( event );
if ( !keyEvent )
{
return false;
}
return filterKeyPress( keyEvent ) ;
}
bool QgsAdvancedDigitizingDockWidget::filterKeyPress( QKeyEvent* e )